BP20: Tungsten-Rhenium Spring Wire

Do you want to buy tungsten-rhenium spring wire BP20: price from supplier Evek GmbH? With us you will find only quality products with prompt delivery practically all over the world.

Chemical composition and properties

According to Jae0.021.142 TU, the alloy in question contains 79.15% of tungsten and 19.25% to 20.75% of rhenium. In small amounts (not more than 0.5%) high-temperature oxides of potassium, sodium, silicon and aluminum are also added to the alloy in order to improve the thermal resistance of the finished wire. In this case the consumer can choose from the following range, mm: 0.10; 0.15; 0.20; 0.35 and 0.5 mm.

The combined effect of rhenium and tungsten provides the following consumer benefits to the alloy BP20:

High heat resistance and refractoriness.

Resistance to corrosion (especially high-temperature corrosion).

Resistance to the effects of aggressive gaseous media and carbides.

Stability of thermoelectric characteristics in the temperature range of 0...25000С.

Of particular importance for practical application of alloy ВР20 is its extremely high elasticity which amounts to 36000-388000 kg/mm2 depending on the temperature. Thus, the springiness of the drawn wire determines its durability under external mechanical influences. After removal of load the initial configuration and positioning are quickly restored.

Application

Spring tungsten-rubber wire of ВР20 grade is an indispensable material for thermocouples of thermoelectric sensors, which work under unfavorable temperature conditions. Deviation of measured thermoelectric emf from nominal values does not exceed 3...5% when external temperature changes within the range from 1400 to 25000С. For graduated thermocouples the wire can also be supplied in an annealed state.

The supplier - Evek GmbH - guarantees accuracy of the product within the range of ±0.0050...±0.0250 mm, which allows for manufacturing of high precision thermocouples for controlling the operation of various metallurgical plants.

Wire ВР20 may also be used for manufacturing of filaments and thermosensors in specialized chromatography devices, as well as in low-current electronic systems of television and defense equipment.

The products are supplied in coils and, importantly, at the manufacturer's price.